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 <h1>预定义常量</h1>

 <p class="simpara">下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。</p>
 <div class="warning"><strong class="warning">Warning</strong>
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   SPL uses class constants since PHP 5.1. Prior releases use global constants
   in the form <strong><code>RIT_LEAVES_ONLY</code></strong>.
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